Downloading the Microsoft Office 365 offline installer is the most reliable way to install the suite on computers with limited or unstable internet connections
setup.exe /download config-offline.xml
John's internet connection at home was slow, and he knew it would take hours to download the entire Office 365 suite. Moreover, he had to travel frequently for work and wouldn't always have a stable internet connection. He needed a way to install Office 365 offline, without relying on an internet connection. microsoft office 365 offline installer